ABSTRACT
The aim - to assess some medical and social aspects of the epidemic process during the first wave of a new coronavirus infectious disease - COVID-19 in the Republic of Tajikistan. Material and methods. The retrospective study was conducted on the basis of an epidemiological analysis of official statistics as part of the epidemiological surveillance of COVID-19 from April 2020 to April 2021. Results and discussion. At the beginning of April 2021, a total of 13 308 cases of COVID-19 were registered, of which the proportion of recovered was 99.3% (13 218 cases), and the number of cases with a fatal outcome was 0.68% (90 cases;the average age of the deceased was 62.3+/-0.07 years). The peak of infection during the first wave occurred in May and June 2020, when the average daily increase was 97 people. For 2 months of the epidemic in the republic, 44.6% of the total number of patients with COVID-19 became infected, and the number of deaths reached 52 people or 57.7%. Among the patients, men prevailed (65%). The largest number of deaths (76.7%;n=69) was among older people with comorbidities (diabetes mellitus, cardiovascular disease, chronic lung disease, metabolic syndrome, etc.). An analysis of the age structure showed that the main proportion of cases fell on the age group of 40-60 years (42.6%). It was found that a significant proportion of patients with COVID-19 was detected in the Sughd region (33.0%) and Dushanbe (30.1%). Conclusion. The COVID-19 pandemic showed that the national healthcare system of the Republic of Tajikistan was not sufficiently prepared for such a development of the COVID-19 epidemic process. There was an acute shortage of medical and preventive specialists in the republic. Given the current situation in the Republic of Tajikistan, within the framework of epidemiological surveillance, the features of the course of the COVID-19 epidemic process were analyzed, adequate emergency measures were developed and proposed to limit the spread of the virus and reduce the negative impact of COVID-19 on public health. The number of beds has been reasonably expanded, the capacity of the laboratory service has been increased, mass vaccination of the population has been started according to epidemic indications.Copyright © 2022 Geotar Media Publishing Group
ABSTRACT
Despite all efforts of the world community, the COVID-19 pandemic remains one of the main epidemiological challenges of our time. Even with its widespread distribution, the infection may have certain local features due to social, geographic, and climatic factors. Objective(s): to study collective immunity to SARS-CoV-2 in the population of the Republic of Tajikistan. A cross-sectional, randomized study of herd immunity was carried out according to a program developed by Rospotrebnadzor and the St. Petersburg Pasteur Institute, taking into account WHO recommendations. The ethics committees of the corresponding entities approved the study: Tajik Ministry of Health and Social Protection;and the St. Petersburg Pasteur Institute (Russia). Based on questionnaire results, 4,022 people were selected, representing 0.15% (95% CI: 0.14-0.15) of the total population randomized by age and region. In subsequent laboratory analysis, 3682 people took part. The distribution and quantitative content of antibodies (Abs) to viral nucleocapsid (N Ag) and receptor binding domain (RBD Ag) were determined by ELISA. When questioned, a history of SARS-CoV-2 vaccination was indicated by 69.7% (95% CI: 68.2-71.2) of the volunteer cohort. Vector vaccines were most frequently used (50.6%;95% CI: 48.7-52.5), with whole-virion inactivated preparations in second place (23.0%: 95% CI: 21.4-26.6) and mRNA vaccines in third place (21.0%;95% CI:19.4-22.6). The cohort (n = 3682) featured 27.5% men and 72.5% women. The overall seroprevalence was 98.5% (95% CI: 97.7-99.2) in men and 99.4% (95% CI: 99.0-99.6) in women (differences statistically insignificant). Overall seroprevalence in the cohort was 99.2% (95% CI: 98.8-99.4) and ranged from 97.2 to 100% in certain subgroups. Asymptomatic seropositivity in the whole cohort was 98.4% (95% CI: 97.6-99.1). As a result of a mandatory vaccination program introduced in Tajikistan under a COVID-19 Emergency Project, the level of herd immunity among vaccinated individuals reached 99.5% (95% CI: 99.1-99.7), which is similar to the level reached in the cohort as a whole. The epidemic situation that developed in Tajikistan by mid-March 2022 was characterized by an almost absolute level of herd immunity, as evidenced by an absence of detected overt COVID-19 cases since the end of February (2022).Copyright © Popova A.Yu. et al., 2023 The article can be used under the Creative Commons Attribution 4.0 License.
ABSTRACT
The aim - to assess some medical and social aspects of the epidemic process during the first wave of a new coronavirus infectious disease - COVID-19 in the Republic of Tajikistan. Material and methods. The retrospective study was conducted on the basis of an epidemiological analysis of official statistics as part of the epidemiological surveillance of COVID-19 from April 2020 to April 2021. Results and discussion. At the beginning of April 2021, a total of 13 308 cases of COVID-19 were registered, of which the proportion of recovered was 99.3% (13 218 cases), and the number of cases with a fatal outcome was 0.68% (90 cases;the average age of the deceased was 62.3±0.07 years). The peak of infection during the first wave occurred in May and June 2020, when the average daily increase was 97 people. For 2 months of the epidemic in the republic, 44.6% of the total number of patients with COVID-19 became infected, and the number of deaths reached 52 people or 57.7%. Among the patients, men prevailed (65%). The largest number of deaths (76.7%;n=69) was among older people with comorbidities (diabetes mellitus, cardiovascular disease, chronic lung disease, metabolic syndrome, etc.). An analysis of the age structure showed that the main proportion of cases fell on the age group of 40-60 years (42.6%). It was found that a significant proportion of patients with COVID-19 was detected in the Sughd region (33.0%) and Dushanbe (30.1%). Conclusion. The COVID-19 pandemic showed that the national healthcare system of the Republic of Tajikistan was not sufficiently prepared for such a development of the COVID-19 epidemic process. There was an acute shortage of medical and preventive specialists in the republic. Given the current situation in the Republic of Tajikistan, within the framework of epidemiological surveillance, the features of the course of the COVID-19 epidemic process were analyzed, adequate emergency measures were developed and proposed to limit the spread of the virus and reduce the negative impact of COVID-19 on public health. The number of beds has been reasonably expanded, the capacity of the laboratory service has been increased, mass vaccination of the population has been started according to epidemic indications. © 2022 Geotar Media Publishing Group